Ask about pet policy [what pets are allowed, if certain pets incur an extra fee and how much if there is one]

Check the water [for color, whether it's hard or soft, how the faucets flow, how fast it heats]

Check the rooms [measure it and all of your furniture to make sure that there's enough space, check for the number of plugs, if they all work, and if they're connected to a switch, check for above head light sockets, vents, air conditioning, etc.]

Ask the neighbours about possible infestations [depending on the infestation, either move on or arm yourself]

Greet your neighbours in as friendly a way as possible [good rapport means louder music with smaller consequences]

Ask if anything's included in the buying of the apartment [electric and water are the best. don't shoot for heating/cooling]

Ask if there's an up front deposit and/or a last month's rent that needs to be paid.

Ask about the facilities [washer/dryer is vital to existence. if there isn't one on site, if there's one nearby (like a block away) then it's okay. otherwise, ditch the bitch.]

Check on the things included with the apartment for whether it works or not [burners on the stove, bulb sockets working, closet space, the power box functioning, etc.]

Ask if you're allowed to do any alterations [e.g., nailing something up, taking nails out and placing fixtures elsewhere]